Display device

ABSTRACT

A display device is disclosed. The display device of the present disclosure comprises: a housing, which is elongated and has a base; a roller rotatably provided on the base in the housing; a display panel, which is wound around or unwound from the roller; a module cover which is elongated in the longitudinal direction of the housing, and which has a plurality of segments sequentially arranged in the vertical direction of the display panel at the rear side of the display panel, so as to be wound around or unwound from the roller along with the display panel; and a foldable link which is positioned at the rear side of the display panel, of which one side is pivotably connected to the base, and of which the other side is pivotably connected to the upper side of the module cover to raise the display panel and the module cover while unwinding from the roller, wherein the base can be tilted at a predetermined angle with respect to the bottom of the housing.

TECHNICAL

The present disclosure relates to a display device.

Background Art

As the information society has developed, the demand for display device is increasing in various forms, and accordingly, in recent years, various display devices such as a liquid crystal display (LCD), plasma display panel (PDP), electroluminescent display (ELD), vacuum fluorescent display (VFD), Organic Light Emitting Diode (OLED) and the like have been studied and used.

Among them, a display device using an organic light emitting diode (OLED) has excellent luminance and viewing angle characteristics in comparison with a liquid crystal display device and does not require a backlight unit, thereby being implemented in an ultrathin type.

In addition, a flexible display panel can be bent or wound around a roller. The flexible display panel may be used to implement a display device that unfolds on a roller or winds around the roller. Many studies have been made on a structure for winding a flexible display panel around a roller or unwinding the flexible display panel from the roller.

DISCLOSURE OF INVENTION Technical Problem

It is an objective of the present disclosure to solve the above and other problems.

It is another objective of the present disclosure to provide a panel coupling structure of a rollable display device. In It is yet another objective of the present disclosure to improve rolling characteristics of a flexible display panel.

It is yet another objective of the present disclosure to improve flatness of a flexible display panel.

It is yet another objective of the present disclosure to provide a lightweight coupling structure of a flexible display panel.

It is yet another objective of the present disclosure to ensure rigidity of a coupling structure of a flexible display panel.

Solution to Problem

According to an embodiment of the present disclosure in order to achieve the above objectives, there is provided a display device including: a housing which is elongated and has a base; a roller rotatably mounted on the base in the housing; a display panel wound around or unwound from the roller; a module cover elongated in a longitudinal direction of the housing, having a plurality of segments sequentially arranged in an up-down direction of the display panel at a rear of the display panel, and wound around or unwound from the roller together with the display panel; a bonding sheet disposed between the display panel and the module cover and adhered to the display panel and the module cover; and a foldable link disposed at a rear of the display panel, and having one side pivotably connected to the base and the other side pivotably connected to an upper side of the module cover to raise the display panel and the module cover while unwinding the display panel and the module cover from the roller, wherein the bonding sheet includes: a film layer disposed between the display panel and the module cover; and a buffer layer disposed between the film layer and the module cover.

Advantageous Effects of Invention

The display device according to the present disclosure has the following effects.

According to at least one of the embodiments of the present disclosure, a panel coupling structure of a rollable display device may be provided.

According to at least one of the embodiments of the present disclosure, rolling characteristics of a flexible display panel may be improved.

According to at least one of the embodiments of the present disclosure, flatness of a flexible display panel may be improved.

According to at least one of the embodiments of the present disclosure, a lightweight coupling structure of a flexible display panel may be provided.

According to at least one of the embodiments of the present disclosure, rigidity of a coupling structure of a flexible display panel may be ensured.

Further scope of applicability of the present disclosure will become apparent from the detailed description given hereinafter. However, it should be understood that the detailed description and specific examples, while indicating preferred embodiments of the present disclosure, are given by illustration only, since various changes and modifications within the spirit and scope of the present disclosure will become apparent to those skilled in the art from this detailed description.

BRIEF DESCRIPTION OF DRAWINGS

FIGS. 1 to 65 are diagrams illustrating examples of a display device according to embodiments of the present disclosure.

MODE FOR THE INVENTION

Description will now be given in detail according to exemplary embodiments disclosed herein, with reference to the accompanying drawings. For the sake of brief description with reference to the drawings, the same or equivalent components may be denoted by the same reference numbers, and description thereof will not be repeated.

In general, suffixes such as “module” and “unit” may be used to refer to elements or components. Use of such suffixes herein is merely intended to facilitate description of the specification, and the suffixes do not have any special meaning or function.

In the present disclosure, that which is well known to one of ordinary skill in the relevant art has generally been omitted for the sake of brevity. The accompanying drawings are used to assist in easy understanding of various technical features and it should be understood that the embodiments presented herein are not limited by the accompanying drawings. As such, the present disclosure should be construed to extend to any alterations, equivalents and substitutes in addition to those which are particularly set out in the accompanying drawings.

It will be understood that although the terms first, second, etc. may be used herein to describe various elements, these elements should not be limited by these terms. These terms are only used to distinguish one element from another.

It will be understood that when an element is referred to as being “connected with” another element, there may be intervening elements present. In contrast, it will be understood that when an element is referred to as being “directly connected with” another element, there are no intervening elements present.

A singular representation may include a plural representation unless context clearly indicates otherwise.

In the following description, even if an embodiment is described with reference to a specific figure, if necessary, reference numeral not shown in the specific figure may be referred to, and reference numeral not shown in the specific figure is used when the reference numeral is shown in the other figures.

Referring to FIG. 1 , a display device 100 may include a display unit 20 and a housing 30. The housing 30 may have an internal space. At least a portion of the display unit 20 may be located inside the housing 30. At least a portion of the display unit 20 may be located outside the housing 30. The display unit 20 may display a screen.

The direction parallel to the longitudinal direction of the housing 30 may be referred to as a first direction DR1, +x axis direction, −x axis direction, a left direction, or a right direction. The direction in which the display unit 20 displays a screen may be referred to as +z axis, a forward direction, or the front. The direction opposite to the direction in which the display unit 20 displays the screen may be referred to as −z axis, a rearward direction, or the rear. A third direction DR3 may be parallel to +z axis direction or −z axis direction. The direction parallel to the height direction of the display device 100 may be referred to as a second direction DR2, +y axis direction, the −y axis direction, an upper direction, or a lower direction.

The third direction DR3 may be a direction perpendicular to the first direction DR1 and/or the second direction DR2. The first direction DR1 and the second direction DR2 may be collectively referred to as a horizontal direction. In addition, the third direction DR3 may be referred to as a vertical direction. A left and right direction LR may be parallel to the first direction DR1, and an up and down direction UD may be parallel to the second direction DR2.

Referring to FIG. 2 , the display unit 20 may be entirely located inside the housing 30. At least a portion of the display unit 20 may be located outside the housing 30. The degree to which the display unit 20 is exposed to the outside of the housing 30 may be adjusted as necessary.

Referring to FIG. 3 , the display unit 20 may include a display panel 10 and a plate 15. The display panel 10 may be flexible. For example, the display panel 10 may be an organic light emitting display (OLED).

The display panel 10 may have a front surface for displaying an image. The display panel 10 may have a rear surface facing the front surface. The front surface of the display panel 10 may be covered with a light transmissive material. For example, the light transmissive material may be synthetic resin or film.

The plate 15 may be coupled, fastened or attached to the rear surface of the display panel 10. The plate 15 may include a metal material. The plate 15 may be referred to as a module cover 15, a cover 15, a display panel cover 15, a panel cover 15, or an apron 15.

Referring to FIG. 4 , the plate 15 may include a plurality of segments 15 c. A magnet 64 may be located inside a recess 118 of the segment 15 c. The recess 118 may be located on a surface of the segment 15 c facing the display panel 10. The recess 118 may be located in the front surface of each segment 15 c. Since the magnet 64 is accommodated inside the recess 118, the magnet 64 may not protrude from the segment 15 c. The display panel 10 may be flat without being wrinkled even when it is in contact with the segment 15 c.

Referring to FIG. 5 , a plurality of magnets 64 may be located on a link 73. For example, at least one magnet 64 may be located on a first arm 73 a and at least one magnet 64 may be located on a second arm 73 b. The plurality of magnets 64 may be spaced apart from each other.

Referring to FIG. 6 , one magnet 64 may be located on the first arm 73 a and the second arm 73 b, respectively. The magnet 64 may have a shape extended in the long side direction of the first arm 73 a and the second arm 73 b. Since the magnet 64 has a shape extended in the long side direction of the first arm 73 a and the second arm 73 b, the area of the portion where the link 73 is in close contact with the display panel and the module cover may be increased. Accordingly, the adhesion between the link 73 and the display panel and the module cover may be strengthened.

Referring to FIG. 7 , the magnet 64 may be located in a depression 321 formed in the link 73. The depression 321 may have a shape recessed inward of the link 73. The magnet 64 may be coupled to the link 73 through at least one screw 187.

The width LHW in which the depression 321 is recessed inwardly of the link 73 may be equal to or larger than the thickness MGW of the magnet 64. If the thickness MGW of the magnet 64 is larger than the width LHW of the depression 321, the display panel 10 and the module cover 15 may not be in close contact with the link 73. In this case, the display panel 10 may be wrinkled or may not be flat.

A panel protector 97 may be located in the rear surface of the display panel 10. The panel protector 97 may prevent the display panel 10 from being damaged due to friction with the module cover 15. The panel protector 97 may include a metal material. The panel protector 97 may have a very thin thickness. For example, the panel protector 97 may have a thickness of about 0.1 mm.

Since the panel protector 97 contains a metal material, magnetic attraction between the panel protector 97 and the magnet 64 may occur. Accordingly, the module cover 15 located between the panel protector 97 and the link 73 may be in close contact with the magnet 64 even if it does not contain a metal material.

Referring to FIG. 8 , the module cover 15 may be in close contact with the link 73 by an upper bar 75 of the upper side and a guide bar 234 of the lower side (see FIG. 15 ). A portion between the upper bar 75 and the guide bar 234 of the link 73 may not be in close contact with the module cover 15. Alternatively, the central portion of the link 73 may not be in close contact with the module cover 15. The central portion of the link 73 may be near an arm joint 152. In this case, the distance APRD1, APLD2 between the module cover 15 and the link 73 may not be constant. In this case, the display panel 10 may be bent or twisted.

Referring to FIG. 9 , when the magnet 64 is located in the depression 321 of the link 73, the magnet 64 attracts the panel protector 97, so that the module cover 15 can also be in close contact with the magnet at the same time. That is, the central portion of the link 73 may be in close contact with the module cover 15.

Referring to FIG. 10 , a bead 136 may be formed in the upper surface of the segment 15 b. The bead 136 may have a shape recessed inwardly of segment 15 b. The bead 136 may have a shape recessed in the -y axis direction. For example, the bead 136 may be formed by pressing the segment 15 b. A plurality of beads 136 may be formed on the segment 15 b. The plurality of beads 136 may be spaced apart from each other. The bead 136 may enhance the rigidity of segment 15 b. The bead 136 can prevent the shape of the segment 15 b from being deformed due to an external impact.

Referring to FIG. 11 , a source PCB 120 may be located above the module cover 15. In the case of roll-up or roll-down, the position of the source PCB 120 may be changed with the movement of the module cover 15. A FFC cable 231 may be located in the central portion of the module cover 15 based on the first direction. The FFC cable 231 may be located in both ends of the module cover 15 based on the first direction.

Referring to FIG. 12 , the segment 15 d may include a depression 425 recessed in the -z axis direction. The depression 425 may form a space between the display panel 10 and the module cover 15. The FFC cable 231 may be accommodated in a space formed by the depression 425. In addition, the depression 425 may improve the rigidity of the segment 15 d.

The bead 136 may be located on the segment 15 d excluding a portion where the depression 425 is located. The bead 136 may not be located in the portion where the depression 425 is located because the thickness of the segment 15 d in the third direction becomes thinner.

Referring to FIG. 13 , a penetrating portion 437 may be located in the central portion of the segment 15 e based on the first direction. The penetrating portion 437 5 may penetrate the central portion of the segment 15 e in the second direction. That is, the penetrating portion 437 may be a hole located in the segment 15 e. The penetrating portion 437 may be a portion where the FFC cable 231 is located. Since the penetrating portion 437 is formed in the segment 15 e, the thickness of the segment 15 e may be reduced in comparison with the case where the FFC cable 231 is located in the depression 425.

The bead 136 may be located on the segment 15 e excluding a portion where the penetrating portion 437 is located. In the portion where the penetrating portion 437 is located, the bead 136 may not be located because the thickness of the segment 15 e in the third direction becomes thinner.

Referring to FIG. 14 , a top case 167 may cover the source PCB 120 and the upper bar 75 as well as the display panel 10 and the module cover 15. One surface of the upper bar 75 may be coupled to the rear surface of the module cover 15, and the other surface thereof may be coupled to the source PCB 120. The upper bar 75 may be fixed to the module cover 15 to support the source PCB 120.

The lower end of the FFC cable 231 may be connected to a timing controller board 105 (see FIG. 15 ) inside a panel roller 143 (see FIG. 15 ). The FFC cable 231 may be wound around or unwound from the panel roller 143 together with the display unit 20.

A portion of the FFC cable 231 may be located between the display panel 10 and the module cover 15. A portion of the FFC cable 231 located between the display panel 10 and the module cover 15 may be referred to as a first portion 231 a. The first portion 231 a may be located in the depression 425 formed by the plurality of segments 15 d. Alternatively, the first portion 231 a may be accommodated in the depression 425 formed by the plurality of segments 15 d.

A portion of the FFC cable 231 may penetrate the segment 15 f. A portion of the FFC cable 231 that passes through the segment 15 f may be referred to as a second portion 231 b. The segment 15 f may include a first hole 521 a formed in the front surface and a second hole 521 b formed in the rear surface. The first hole 521 a and the second hole 521 b may be connected to each other to form a single hole 521. The hole 521 may penetrate the segment 15 f in the third direction. The second portion 231 b may penetrate the hole 521. The hole 521 may be referred to as a connection hole 521.

The upper end of the FFC cable 231 may be electrically connected to the source PCB 120. A part of the FFC cable 231 may be located in the rear surface of the module cover 15. A portion of the FFC cable 231 located in the rear surface of the module cover 15 may be referred to as a third portion 231 c. The third portion 231 c may be electrically connected to the source PCB 120.

The third portion 231 c may be covered by the top case 167. Accordingly, the third portion 231 c may not be exposed to the outside.

Referring to FIG. 15 , the FFC cable 231 may be connected to the timing controller board 105 mounted in the panel roller 143. A penetrating hole 615 may be formed on the panel roller 143, and the FFC cable 231 may be connected to the timing controller board 105 through the penetrating hole 615.

The penetrating hole 615 may be located in one side of the panel roller 143 and may penetrate an outer circumferential portion of the panel roller 143. The FFC cable 231 may be connected to one side of the timing controller board 105 through the penetrating hole 615.

Even when the FFC cable 231 is located in the outer circumference of the panel roller 143, it may maintain the connection with the timing controller board 105 due to the penetrating hole 615. Accordingly, the FFC cable 231 may rotate together with the panel roller 143 to prevent twisting.

A part of the FFC cable 231 may be wound around the panel roller 143. A portion of the FFC cable 231 wound around the panel roller 143 may be referred to as a fourth portion 231 d. The fourth portion 231 d may be in contact with the outer circumferential surface of the panel roller 143.

A part of the FFC cable 231 may pass through the penetrating hole 615. A portion of the FFC cable 231 passing through the penetrating hole 615 may be referred to as a fifth portion 231 e.

The lower end of the FFC cable 231 may be electrically connected to the timing controller board 105. A part of the FFC cable 231 may be located inside the panel roller 143. A portion of the FFC cable 231 located inside the panel roller 143 may be referred to as a sixth portion 231 f. The sixth portion 231 f may be electrically connected to the timing controller board 105.

Referring to FIG. 16 , the lower end of the display panel 10 may be connected to the roller 143. The display panel 10 may be wound around or unwound from the roller 143. The front surface of the display panel 10 may be coupled to the plurality of source PCBs 120. The plurality of source PCBs 120 may be spaced apart from each other.

A source chip on film (COF) 123 may connect the display panel 10 and the source PCB 120. The source COF 123 may be located in the front surface of the display panel 10. The roller 143 may include a first part 331 and a second part 337. The first part 331 and the second part 337 may be fastened by a screw. The timing controller board 105 may be mounted in the roller 143.

The source PCB 120 may be electrically connected to the timing controller board 105. The timing controller board 105 may send digital video data and the timing control signal to the source PCB 120.

The cable 117 may electrically connect the source PCB 120 and the timing controller board 105. For example, the cable 117 may be a flexible flat cable (FFC). The cable 117 may penetrate the hole 331 a. The hole 331 a may be formed in a seating portion 379 or the first part 331. The cable 117 may be located between the display panel 10 and the second part 337.

The seating portion 379 may be formed in an outer circumference of the first part 331. The seating portion 379 may be formed by stepping a portion of the outer circumference of the first part 331. The seating portion 379 may form a space B. When the display unit 20 is wound around the roller 143, the source PCB 120 may be accommodated in the seating portion 379. Since the source PCB 120 is accommodated in the seating portion 379, the source PCB 120 may not be twisted or bent, and durability may be improved.

The cable 117 may electrically connect the timing controller board 105 and the source PCB 120.

Referring to FIG. 17 , the roller 143 wound around with the display unit 20 may be installed in a first base 31. The first base 31 may be a bottom surface of the housing 30. The roller 143 may be extended along the longitudinal direction of the housing 30. The first base 31 may be connected to the side surface 30 a of the housing 30.

Referring to FIGS. 18 and 19 , the beam 31 a may be formed in the first base 31. The beam 31 a may improve the bending or torsional rigidity of the first base 31. Many components may be installed in the first base 31, and the first base 31 can receive a large load. Since the rigidity of the first base 31 is improved, sagging due to the load can be prevented. For example, the beam 31 a may be formed by a pressing process.

The second base 32 may be spaced upward from the first base 31. The space S1 may be formed in the first base 31 and the second base 32. The roller 143 wound around with the display unit 20 may be accommodated in the space S1. The roller 143 may be located between the first base 31 and the second base 32.

The second base 32 may be connected to the side surface 30 a of the housing 30. The bracket 33 may be fastened to the upper surface of the first base 31. The bracket 33 may be fastened to the side surface 30 a of the housing 30.

The beam 32 a may be formed in the second base 32. The beam 32 a may improve the bending or torsional rigidity of the second base 32. For example, the beam 32 a may be formed by a press process.

A third part 32 d may be connected to the first part 32 b and the second part 32 c. A fourth part 32 e may be connected to the first part 32 b and the second part 32 c. A space S2 may be formed between the third part 32 d and the fourth part 32 e. Accordingly, bending or torsional rigidity of the second base 32 may be improved. The third part 32 d may be referred to as a reinforcing rib 32 d or a rib 32 d. The fourth part 32 e may be referred to as a reinforcing rib 32 e or a rib 32 e.

Many components can be installed in the second base 32 and the second base 32 can receive a large load. As the rigidity of the second base 32 is improved, sagging due to the load can be prevented.

A first reinforcing plate 34 may be located between the first base 31 and the second base 32. The first reinforcing plate 34 and the second base 32 may be fastened by a screw. The first reinforcing plate 34 may support the second base 32. The first reinforcing plate 34 may prevent sagging of the second base 32. The first reinforcing plate 34 may be located in the central portion of the first base 31 or in the central portion of the second base 32. The first reinforcing plate 34 may include a curved portion 34 a. The curved portion 34 a may be formed along the roller 143. The curved portion 34 a may not be in contact with the roller 143 or the display unit 20 wound around the roller 143. The curved portion 34 a may maintain a certain distance from the roller 143 so as not to interfere with the rotation of the roller 143.

A second reinforcing plate 35 may be fastened to the first base 31 and the first reinforcing plate 34. The second reinforcing plate 35 may support the first reinforcing plate 34. The second reinforcing plate 35 may be located behind the first reinforcing plate 34. The second reinforcing plate 35 may be located behind the first 20 base 31. The second reinforcing plate 35 may be located perpendicular to the first base 31. The second reinforcing plate 35 may be fastened to the beam 31 a of the first base 31. The second base 32 may face the front surface or rear surface of the housing 30.

Referring to FIG. 20 , the second base 32 f may not form a space. When the load that the second base 32 f receives is not large, the second base 32 f may have sufficient rigidity by including the beam 32 g. The first base 31′ may include a beam 31 a′.

Referring to FIGS. 21 and 22 , a motor assembly 810 may be installed in the second base 32. Drive shaft of the motor assembly 810 may be formed in both sides. The right driving shaft and the left driving shaft of the motor assembly 810 may rotate in the same direction. Alternatively, the right driving shaft and the left driving shaft of the motor assembly 810 may rotate in opposite directions.

The motor assembly 810 may include a plurality of motors. The plurality of motors may be connected in series with each other. The motor assembly 810 may output a high torque by connecting a plurality of motors in series.

A lead screw 840 may be located in the left side and the right side of the motor assembly 810, respectively. The motor assembly 810 may be connected to the lead screw 840. A coupling 811 may connect the lead screw 840 and the drive shaft of the motor assembly 810.

The lead screw 840 may be threaded along the longitudinal direction. The direction of the threads formed in the right lead screw 840 and the direction of the threads formed in the left lead screw 840 may be opposite to each other. The direction of the threads formed in the right lead screw 840 and the direction of the threads formed in the left lead screw 840 may be the same. The pitches of the left lead screw 840 and the right lead screw 840 may be the same.

The bearing 830 a, 830 b may be installed in the second base 32. The bearing 830 a, 830 b may support both sides of the lead screw 840. The bearing 830 a, 830 b may include an inner bearing 830 b located close to the motor assembly 810 and an outer bearing 830 a located far from the motor assembly 810. The lead screw 840 may be stably rotated by the bearing 830 a, 830 b.

The slide 820 may be engaged with the lead screw 840. The slide 820 may move forward or rearward in the longitudinal direction of the lead screw 840 according to the rotation of the lead screw 840. The slide 820 may move between the outer bearing 830 a and the inner bearing 830 b. The slide 820 may be located in the left lead screw 840 and the right lead screw 840, respectively. The left slide 820 may be engaged with the left lead screw 840. The right slide 820 may be engaged with the right lead screw 840.

The left slide 820 and the right slide 820 may be located symmetrically with respect to the motor assembly 810. Due to the driving of the motor assembly 810, the left slide 820 and the right slide 820 may move far away or approach from each other by the same distance.

Referring to FIG. 23 , the motor assembly 810 may include a plate 813. The plate 813 may be referred to as a mount plate 813 or a motor mount plate 813. A coupling portion 32 h may be formed in an upper surface of second base 32. The plate 813 may be fastened to the coupling portion 32 h through a screw S. The motor assembly 810 may be spaced apart from the top surface of the second base 32. A washer 813 may be located between the top surface of the plate 813 and the screw S. The washer 813 may include a rubber material. The washer 813 may reduce vibration generated in the motor assembly 810. The washer 813 may improve driving stability of the display device 100.

Referring to FIG. 24 , a guide rail 860 may be installed in the second base 32. The guide rail 860 may be located in parallel with the lead screw 840. The slide 820 may be engaged with the guide rail 860. A first stopper 861 b may be located in one side of the guide rail 860, and a second stopper 861 a may be located in the other side of the guide rail 860. The range in which the slide 820 can move may be limited to between the first stopper 861 b and the second stopper 861 a.

A spring 850 may wrap the lead screw 840. The lead screw 840 may penetrate the spring 850. The spring 850 may be located between the inner bearing 830 b and the slide 820. One side of the spring 850 may contact the inner bearing 830 b, and the other side of the spring 850 may contact the slide 820. The spring 850 may provide an elastic force to the slide 820.

When the slide 820 is caught in the first stopper 861 b, the spring 850 may be maximally compressed. When the slide 820 is caught in the first stopper 861 b, the length of the spring 850 may be minimized. When the slide 820 is caught in the first stopper 861 b, the distance between the slide 820 and the inner bearing 830 b may be minimized.

Referring to FIG. 25 , when the slide 820 is caught in the second stopper 861 a, the spring 850 may be maximally tensioned. When the slide 820 is caught in the second stopper 861 b, the length of the spring 850 may be maximized. When the slide 820 is caught in the second stopper 861 a, the distance between the slide 820 and the inner bearing 830 b may be maximized.

Referring to FIG. 26 , the first part 820 a may be engaged with the guide rail 860. The first part 820 a may move along the guide rail 860. Movement of the first part 820 a in the longitudinal direction of the guide rail 860 may be restricted. The second part 820 b may be located above the first part 820 a. The first part 820 a and the second part 820 b may be fastened through a screw. The second part 820 b may be spaced apart from the guide rail 860. The lead screw 840 may penetrate the second part 820 b. For example, the second part 820 b may include a male thread that engages with a female thread of the lead screw 840. Accordingly, even if the lead screw 840 is rotated, the slide 820 can be stably moved forward or rearward along the guide rail 860 without rotating.

The third part 820 c may be coupled to one side of the second part 820 b. The third part 820 c may contact the spring 850. The third part 820 c may be provided with an elastic force from the spring 850.

Referring to FIGS. 27 and 28 , a link mount 920 may be installed in the second base 32. One side of a second arm 912 may be pivotably connected to a link mount 920. The other side of the second arm 912 may be pivotably connected to a joint 913. The other side of the second arm 912 may be pivotably connected to a second axis 913 b. One side of a rod 870 may be pivotably connected to the slide 820. The other side of the rod 870 may be pivotably connected to the second arm 912 or a third arm 915. One side of the third arm 915 may be pivotably connected to the link mount 920. The other side of the third arm 915 may be pivotably connected to the other side of the rod 870. The link mount 920 may include a shaft 921. The second arm 912 or the third arm 915 may be pivotably connected to the shaft 921.

A link bracket 951 may be referred to as a link cap 951. The link bracket 951 may be coupled to a top case 950. The top case 950 may be referred to as a case top 950, an upper bar 950, a top 950, or a bar 950. The top case 950 may be located in an upper end of the display unit 20. The display unit 20 may be fixed to the top case 950.

One side of a first arm 911 may be pivotably connected to the joint 913. One side of the first arm 911 may be pivotably connected to a first shaft 913 a. The other side of the first arm 911 may be pivotably connected to the link bracket 951 or the top case 950.

A gear g1 may be formed in one side of the first arm 911. A gear g2 may be formed in the other side of the second arm 912. The gear g1 of the first arm 911 and the gear g2 of the second arm 912 may be engaged with each other.

When the slide 820 approaches the outer bearing 830 a, the second arm 912 or the third arm 915 may stand up. At this time, the direction in which the second arm 912 or the third arm 915 stands may be referred to as a standing direction DRS.

The second arm 912 may include a protrusion 914 protruding in the standing direction DRS. The protrusion 914 may be referred to as a connection part 914. The third arm 915 may include a protrusion 916 protruding in the standing direction DRS. The protrusion 916 may be referred to as a connection part 916. The protrusion 914 of the second arm 912 and the protrusion 916 of the third arm 915 may face or contact each other. The other side of the rod 870 may be fastened to the protrusion 914 of the second arm 912 or the protrusion 916 of the third arm 915.

A link 910 may include a first arm 911, a second arm 912, a third arm 915, and/or a joint 913.

Referring to FIGS. 29 and 30 , an angle formed by the second arm 912 or the third arm 915 with respect to the second base 32 may be referred to as theta S. When the rod 870 is connected to the upper side of the second part 820 b, an angle between the rod 870 and the second base 32 may be referred to as theta A, and the minimum force for the rod 870 to stand the second arm 912 or the third arm 915 may be referred to as Fa. When the rod 870 is connected to the middle of the second part 820 b, an angle between the rod 870 and the second base 32 may be referred to as theta B, and the minimum force for the rod 870 to stand the second arm 912 or the third arm 915 may be referred to as Fb. When the rod 870 is connected to the lower side of the second part 820 b, an angle between the rod 870 and the second base 32 may be referred to as theta C, and the minimum force for the rod 870 to stand the second arm 912 or the third arm 915 may be referred to as Fc.

A relationship of theta A <theta B <theta C can be established for the same theta S. In addition, a relationship of Fc <Fb <Fa may be established for the same theta S. If an angle formed by the second arm 912 or the third arm 915 with respect to the second base 32 is the same, the force required to stand up the second arm 912 or the third arm 915 can become smaller as the angle formed by the rod 870 and the second base 32 increases. The rod 870 may be connected to the lower side of the second part 820 b to reduce the load applied on the motor assembly 810.

Referring to FIG. 31 , the rod 870′ may not be connected to the protrusion of the second arm 912′ or the protrusion of the third arm 915′. When the angle formed by the second arm 912′ or the third arm 915′ with respect to the second base 32 is theta S, the angle formed by the rod 870′ and the second base 32 is referred to as theta 1, and the minimum force for the rod 870′ to stand up the second arm 912′ or the third arm 915′ may be referred to as F1.

Referring to FIG. 32 , the rod 870 may be connected to the protrusion 914 of the second arm 912 or the protrusion 916 of the third arm 915. When the angle formed by the second arm 912 or the third arm 915 with respect to the second base 32 is theta S, the angle formed by the rod 870 and the second base 32 may be referred to as theta 2, and the minimum force for the rod 870 to stand the second arm 912 or the third arm 915 may be referred to as F2.

Referring to FIG. 33 , when theta S is the same, theta 2 may be greater than theta 1. If Theta S is the same, F1 can be greater than F2. If the angle formed by the second arm 912, 912′ and the second base 32 is the same, the force required to stand up the second arm 912, 912′ may become smaller as the angle formed by the rod 870, 870′ and the second base 32 becomes larger. The rod 870 may be connected to the protrusion 914, 916 to stand up the second arm 912 with less force than a case where the rod 870′ is not connected to the protrusion. The rod 870 may be connected to the 914, 916 to reduce the load applied on the motor assembly 810.

Referring to FIG. 34 , the second arm 912 or the third arm 915 may have a central axis CR. When the rod 870 is fastened to the second arm 912 by a distance r away from the central axis CR, the angle formed by the rod 870 and the second base 32 may be referred to as theta 2, and the minimum force for the 870 to stand the second arm 912 or the third arm 915 may be referred to as F3. When the rod 870 is fastened to the second arm 912 by a distance r′ away from the central axis CR, the angle formed by the rod 870 and the second base 32 may be referred to as theta 2′, and the minimum force for the rod 870 to stand the second arm 912 or the third arm 915 may be referred to as F4. When the rod 870 is fastened to the second arm 912 by a distance r″ away from the central axis CR, the angle formed by the rod 870 and the second base 32 may be referred to as theta 2″, and the minimum force for the rod 870 to stand the second arm 912 or the third arm 915 may be referred to as F5.

Referring to FIG. 35 , when theta S is the same, theta 2″ may be greater than theta 2′, and theta 2′ may be greater than theta 2. When theta S is the same, F3 may be greater than F4, and F4 may be greater than F5. As the rod 870 is fastened away from the central axis CR, the force required to stand the second arm 912 may be smaller. Since the rod 870 is fastened away from the central axis CR, the load on the motor assembly 810 may be reduced.

Referring to FIG. 36 , the first arm 911 and the second arm 912 may be in contact with or close to the rear surface of the display unit 20. Since the first arm 911 and the second arm 912 are in contact with or close to the rear surface of the display unit 20, the display unit 20 may be stably wound around or unwound from a roller. The link mount 920 may include a first part 922 and a second part 923. The first part 922 and the second part 923 may face each other. A space S4 may be formed between the first part 922 and the second part 923. The first part 922 may face the display unit 20. The first part 922 may be located closer to the display unit 20 than the second part 923. The second arm 912 may be pivotably connected to the front surface of the first part 922. A part of the third arm 915 may be accommodated in the space S4 and pivotably connected to the first part 922 or the second part 923.

Referring to FIG. 37 , the rod 870 may include a first part 871 and a second part 872. The first part 871 may include a connection part 871 a in one side thereof. The second part 872 of the slide 820 may form a space S5 therein. The connection part 871 a may be inserted into the space S5. The connection part 871 a may be pivotably connected to the second part 820 b (see FIG. 36 ) of the slide 820. The other side of the first part 871 may be connected to one side of the second part 872. The other side of the second part 872 may be pivotably connected to the second arm 912 or the third arm 915. The first part 871 may form a space S3 therein. The first part 871 may include a hole 871 b. The lead screw 840 may be accommodated in the hole 871 b or the space S3.

The distance between the second part 872 and the display unit 20 may be D1. The second arm 912 may have a thickness W1. A portion of the third arm 915 accommodated in the space S4 may have a thickness W3. The thickness W3 may be equal to the distance between the first part 922 and the second part 923. A portion of the third arm 915 that is not accommodated in the space S4 may have a thickness W2. The first part 922 may have a thickness W4. The thickness W2 may be greater than the thickness W3. The thickness W2 may be equal to the sum of the thickness W3 and the thickness W4. D1 may be the sum of the thickness W1 and the thickness W2.

The second arm 912 may be located in contact with or close to the rear surface of the display unit 20, and the third arm 915 may be located between the second arm 912 and the second part 872. The second part 872 can stably transmit power for standing the second arm 912 due to the third arm 915. The second part 872 may be connected to the first part 871 by moving forward with respect to the axis of rotation of the lead screw 840, so as to stably stand the second arm 912 or the third arm 915. Thus, the play between the second arm 912 and the second part 872 may be minimized.

Referring to FIG. 38 , a pusher 930 may be installed in the link mount 920. The pusher 930 may be referred to as a lifter 930. A second part 932 may be fastened to the first part 931. The second part 932 may be in contact with or separated from the link bracket 951. The second part 932 may be made of a material having high elasticity. The first part 931 may be made of a material having a lower elasticity than the second part 932. The first part 931 may be made of a material having a higher rigidity than the second part 932. The first part 931 and the second part 932 may be collectively referred to as a head 936. The head 936 may be located above the link mount 920.

A third part 933 may be connected to the first part 931. Alternatively, the third part 933 may be extended downward from the first part 931. The third part 933 may be referred to as a tail 933. A fourth part 934 may protrude from the third part 933. The link mount 920 may form a space S6, and the third part 933 may be accommodated in the space S6. The space S6 may be opened upward. The space S6 in which the third part 933 is accommodated may be adjacent to the space S4 (see FIG. 37 ) in which the third arm 915 is accommodated. The second part 932 of the link mount 920 may include a hole 924. The hole 924 may be a long hole formed in the vertical direction. The length of the hole 924 may be H1. The fourth part 934 may be inserted into the hole 924. The spring 935 may be accommodated in the space S6. The spring 935 may be located below the third part 933. The spring 935 may provide an elastic force in the direction perpendicular to the third part 933.

The head 936 may be larger than the diameter of the space S6. When the head 936 is caught in the upper end of the space S6, the height of the head 936 from the second base 32 may be minimized. The minimum height of the head 936 may be referred to as H2. When the height of the head 936 is minimized, the fourth part 934 may be caught in the lower end of the space S6. When the height of the head 936 is minimized, the spring 935 may be maximally compressed. When the height of the head 936 is minimized, the elastic force provided by the spring 935 may be maximized. When the height of the head 936 is minimized, the height of the top case 950 may be maximized.

The pusher 930 may provide elastic force to the link bracket 951, while being in contact with the link bracket 951. Thus, the load applied on the motor assembly 810 to stand up the link 910 may be reduced.

Referring to FIG. 39 , when the link 910 stands up sufficiently, the pusher 930 may be separated from the link bracket 951. When the pusher 930 is separated from the link bracket 951, the height of the head 936 from the second base 32 may be maximized. The maximum height of the head 936 may be referred to as H3. When the height of the head 936 is maximized, the fourth part 934 may be caught in the upper end of the hole 924 (see FIG. 38 ). If the height of the head 936 is maximized, the spring 935 may be maximally tensioned. When the height of the head 936 is maximized, the elastic force provided by the spring 935 may be minimized. The maximum height H3 of the head 936 may be substantially equal to the sum of the minimum height H2 of the head 936 and the length H1 of the hole.

Referring to FIG. 40 , the display unit 20 may be in a state of being maximally wound around the roller 143. The display device 100 may be symmetrical with respect to the motor assembly 810. The height of the top case 950 may be minimized. The slide 820 may be in a position closest to the inner bearing 830 b. The slide 820 may be in a state of being caught in the first stopper 861 b. The spring 850 may be in a maximally compressed state. The pusher 930 may be in contact with the link bracket 951. The height of the pusher 930 may be minimized.

Referring to FIG. 41 , about half of the display unit 20 may be in a state of being wound around the roller 143. The display device 100 may be symmetrical with respect to the motor assembly 810. About half of the display unit 20 may be in a state of being unwound from the roller 143. The slide 820 may be located between the first stopper 861 b and the second stopper 861 a. The pusher 930 may be separated from the link bracket 951. The height of the pusher 930 may be maximized.

Referring to FIG. 42 , the display unit 20 may be in a state of being maximally unwound from the roller 143. The display device 100 may be symmetrical with respect to the motor assembly 810. The height of the top case 950 may be maximized. The slide 820 may be in a position closest to the outer bearing 830 a. The slide 820 may be in a state of being caught in the second stopper 861 a. The spring 850 may be in a state of maximum tension. The pusher 930 may be separated from the link bracket 951. The height of the pusher 930 may be maximized.

Referring to FIGS. 43 to 46 , a link mount 920 a, 920 b may be installed in the base 31. The link mount 920 a, 920 b may include a right link mount 920 a spaced to the right from a first right bearing 830 a and a left link mount 920 b spaced to the left from a second left bearing 830 d.

A link 910 a, 910 b may be connected to the link mount 920 a, 920 b. The link 910 a, 910 b may include a right link 910 a connected to the right link mount 920 a and a left link 910 b connected to the left link mount 920 b.

The right link 910 a may be referred to as a first link. The left link 910 b may be referred to as a second link. The right link mount 920 a may be referred to as a first link mount 920 a. The left link mount 920 b may be referred to as a second link mount 920 b.

The link 910 a, 910 b may include a first arm 911 a, 911 b, a second arm 912 a, 912 b, and an arm joint 913 a, 913 b. One side of the second arm 912 a, 912 b may be rotatably connected to the link mount 920 a, 920 b. The other side of the second arm 912 a, 912 b may be rotatably connected to the arm joint 913 a, 913 b. One side of the first arm 911 a, 911 b may be rotatably connected to the arm joint 913 a, 913 b. The other side of the first arm 911 a, 911 b may be rotatably connected to the link bracket 951 a, 951 b.

The link bracket 951 a, 951 b may include a right link bracket 951 a connected to the first arm 911 a of the right link 910 a and a left link bracket 951 b connected to the first arm 911 b of the left link 910 b. The link bracket 951 a, 951 b may be connected to the upper bar 950.

The upper bar 950 may connect the right link bracket 951 a and the left link bracket 951 b.

A rod 870 a, 870 b may connect a slider 860 a, 860 b to the link 910 a, 910 b. One side of the rod 870 a, 870 b may be rotatably connected to the slider 860 a, 860 b. The other side of the rod 870 a, 870 b may be rotatably connected to the second arm 912 a, 912 b. The rod 870 a, 870 b may include a right rod 870 a connecting the right slider 860 a and the second arm 912 a of the right link 910 a and a left rod 870 b connecting the left slider 860 b and the second arm 912 b of the left link 910 b. The right rod 870 a may be referred to as a first rod 870 a. The left rod 870 b may be referred to as a second rod 870 b.

Specifically, a structure formed by a right lead screw 840 a, the right slider 860 a, the right rod 870 a, and the right link 910 a will be described. The right slider 860 a may include a body 861 a and a rod mount 862 a. The body 861 a may have a thread SS formed on an inner circumferential surface thereof. The thread formed in the body 861 a may be engaged with the thread RS of the right lead screw 840 a. The right lead screw 840 a may penetrate the body 861 a.

The rod mount 862 a may be formed in the right side of the body 861 a. The rod mount 862 a may be rotatably connected to one side of the right rod 870 a. The rod mount 862 a may include a first rod mount 862 a 1 and a second rod mount 862 a 2. The first rod mount 862 a 1 may be disposed in front of the right lead screw 840 a. The second rod mount 862 a 2 may be disposed behind the right lead screw 840 a. The first rod mount 862 a 1 and the second rod mount 862 a 2 may be spaced apart from each other. The second rod mount 862 a 2 may be spaced apart from the first rod mount 862 a 1 in the −z axis direction. The right lead screw 840 a may be located between the first rod mount 862 a 1 and the second rod mount 862 a 2.

The rod mount 862 a may be rotatably connected to one side of the rod 870 a through a connecting member C1. The connecting member Cl may penetrate the rod mount 862 a and the right rod 870 a.

The right rod 870 a may be rotatably connected to a second arm 912 a through a connecting member C2. The connecting member C2 may penetrate the second arm 912 a and the right rod 870 a.

The right rod 870 a may include a transmission part 871 a connected to the second arm 912 a of the right link 910 a and a cover 872 a connected to the rod mount 862 a of the right slider 860 a. The transmission part 871 a may transmit a force, which is generated as the right slider 860 a moves forward or rearward along the right lead screw 840 a, to the right link 910 a.

The cover 872 a may include a first plate 873 a disposed in front of the right lead screw 840 a. The first plate 873 a may be disposed perpendicular to the base 31. Alternatively, the first plate 873 a may face the right lead screw 840 a.

The cover 872 a may include a second plate 874 a disposed behind the right

lead screw 840 a. The second plate 874 a may be disposed perpendicular to the base 31. Alternatively, the second plate 874 a may face the right lead screw 840 a. Alternatively, the second plate 874 a may be spaced apart from the first plate 873 a. The right lead screw 840 a may be located between the first plate 873 a and the second plate 874 a.

The cover 872 a may include a third plate 875 a connecting the first plate 873 a and the second plate 874 a. The third plate 875 a may be connected to the transmission part. The third plate 875 a may be located above the right lead screw 840 a.

The cover 872 a may include a fourth plate 876 a connecting the first plate 873 a and the second plate 874 a. The fourth plate 876 a may be connected to the third plate 875 a. The fourth plate 876 a may be located above the right lead screw 840 a.

One side of the first plate 873 a may be connected to the first rod mount 862 a 1. The first plate 873 a and the first rod mount 862 a 1 may be connected through the connecting member C1′. The other side of the first plate 873 a may be connected to the third plate 875 a.

One side of the second plate 874 a may be connected to the second rod mount 862 a 2. The second plate 874 a and the second rod mount 862 a 2 may be connected through the connecting member C1. The other side of the second plate 874 a may be connected to the third plate 875 a.

When the right slider 860 a is moved closer to the motor assembly 810, the right lead screw 840 a and the right rod 870 a may be in contact with each other. When the right lead screw 840 a and the right rod 870 a contact each other, mutual interference may occur and the movement of the right slider 860 a may be restricted.

The cover 872 a may provide a space S1 therein. The first plate 873 a, the second plate 874 a, the third plate 875 a, and the fourth plate 876 a may form the space S1. When the right slider 860 a is moved closer to the motor assembly 810, the right lead screw 840 a may be accommodated or escaped into the space S1 provided by the cover 872 a. The right slider 860 a may move closer to the motor assembly 810 than a case of not having the cover 872 a, due to the space S1 provided by the cover 872 a. That is, the cover 872 a may expand the movable range of the right slider 860 a by providing the space S1 therein. In addition, since the right lead screw 840 a is accommodated in the cover 872 a, the size of the housing 30 (see FIG. 2 ) can be reduced.

In addition, the cover 872 a may limit the minimum value of the angle theta S formed between the second arm 912 a and the base 31. The third plate 875 a of the cover 872 a may contact the second arm 912 a and may support the second arm 912 a, when theta S is sufficiently small. By supporting the second arm 912 a, the third plate 875 a may limit the minimum value of theta S and prevent sagging of the second arm 912 a. That is, the cover 872 a may serve as a stopper for preventing sagging of the second arm 912 a. In addition, the third plate 875 a may reduce the initial load for standing the second arm 912 a by limiting the minimum value of theta S.

The lead screw 840 a, 840 b may be driven by a single motor assembly 810. The lead screw 840 a, 840 b is driven by a single motor assembly 810, so that the second arm 912 a, 912 b can stand up in symmetry. However, when driving the lead screw 840 a, 840 b by a single motor assembly 810, the load on the motor assembly 810 to stand the second arm 912 a, 912 b may be excessively increased. At this time, the third plate 875 a may reduce the load on the motor assembly 810 to stand the second arm 912 a, 912 b, by limiting the minimum value of theta S.

The structure formed by the left lead screw 840 b, the left slider 860 b, the left rod 870 b, and the left link 910 b may be symmetric with the structure formed by the right lead screw 840 a, the right slider 860 a, the right rod 870 a, and the right link 910 a. In this case, the axis of symmetry may be the axis of symmetry ys of the motor assembly 810.

Referring to FIG. 47 , a guide 850 a, 850 b, 850 c, 850 d may be connected to the bearing 830 a, 830 b, 830 c, and 830 d. The guide 850 a, 850 b, 850 c, 850 d may include a right guide 850 a, 850 b disposed in the right side of the motor assembly 810 and a left guide 850 c, 850 d disposed in the left side of the motor assembly 810.

The right guide 850 a, 850 b may have one side connected to a first right bearing 830 a and the other side connected to a second right bearing 830 b. The right guide 850 a, 850 b may be located in parallel with the right lead screw 840 a. Alternatively, the right guide 850 a, 850 b may be spaced apart from the right lead screw 840 a.

The right guide 850 a, 850 b may include a first right guide 850 a and a second right guide 850 b. The first right guide 850 a and the second right guide 850 b may be spaced apart from each other. The right lead screw 840 a may be located between the first right guide 850 a and the second right guide 850 b.

The right slider 860 a may include a protrusion. Alternatively, the display device may include a protrusion formed in the right slider 860 a. The protrusion may be formed in the body of the slider. The protrusion may include a front protrusion (not shown) protruded in the +z-axis direction from the body 861 a of the right slider 860 a and a rear protrusion 865 a protruded in the -z-axis direction from the body of the slider.

The first right guide 850 a may penetrate the rear protrusion 865 a. Alternatively, it may include a first hole 863 a formed in the rear protrusion, and the first right guide 850 a may penetrate the first hole 863 a. The first hole 863 a may be formed in the x-axis direction. The first hole 863 a may be referred to as a hole 863 a.

The second right guide (not shown) may penetrate the front protrusion (not shown). Alternatively, it may include a second hole (not shown) formed in the front protrusion, and the second right guide may penetrate the second hole. The second hole may be formed in the x-axis direction.

The right guide 850 a, 850 b may guide the right slider 860 a to move more stably when the right slider 860 a moves forward or rearward along the right lead screw 840 a. As the right guide 850 a, 850 b stably guides the right slider 860 a, the right slider 860 a can move forward or rearward along the right lead screw 840 a while not rotating with respect to the right lead screw 840 a.

The structure formed by the left guide 850 c, 850 d, the left bearing 830 a, 830 b, 830 c, and 830 d, the left slider 860 b, and the left lead screw 840 b may be symmetrical with the structure formed by the right guide 850 a, 850 b, the right bearing 830 a, 830 b, 830 c, and 830 d, the right slider 860 a, and the right lead screw 840 a. In this case, the axis of symmetry may be the axis of symmetry ys of the motor assembly 810.

Referring to FIG. 48 , a first spring 841 a, 841 b may be inserted into the lead screw 840 a, 840 b. Alternatively, the lead screw 840 a, 840 b may penetrate the first spring 841 a, 841 b. The first spring 841 a, 841 b may include a first right spring 841 a disposed in the right side of the motor assembly 810 and a first left spring 841 b disposed in the left side of the motor assembly 810.

The first right spring 841 a may be disposed between the right slider 860 a and the second right bearing 830 b. One end of the first right spring 841 a may be in contact with or separated from the right slider 860 a. The other end of the first right spring 841 a may be in contact with or separated from the second right bearing 830 b.

When the second arm 912 a is fully laid with respect to the base 31, the distance between the right slider 860 a and the second right bearing 830 b may be a distance RD3. The first right spring 841 a may have a length greater than the distance RD3 in the state of not being compressed or tensioned. Thus, when the second arm 912 a is fully laid with respect to the base 31, the first right spring 841 a may be compressed between the right slider 860 a and the second right bearing 830 b. Then, the first right spring 841 a may provide a restoring force to the right slider 860 a in the +x axis direction.

When the second arm 912 a changes from a fully laid state to a standing state with respect to the base 31, the restoring force provided by the first right spring 841 a may assist the second arm 912 a to stand up. As the first right spring 841 a assists the second arm 912 a to stand up, the load on the motor assembly 810 may be reduced.

The lead screw 840 a, 840 b may be driven by a single motor assembly 810. As the lead screw 840 a, 840 b is driven by a single motor assembly 810, the second arm 912 a, 912 b can stand up in symmetry. However, when the lead screw 840 a, 840 b is driven by a single motor assembly 810, the load on the motor assembly 810 to stand the second arm 912 a, 912 b may be excessively increased. At this time, the first right spring 841 a assists the second arm 912 a to stand up, so that the load on the motor assembly 810 can be decreased, and the load on the motor assembly 810 to stand the second arm 912 a can be reduced.

Alternatively, when the second arm 912 a changes from the standing state to the fully laid state with respect to the base 31, the restoring force provided by the first right spring 841 a can alleviate the shock that occurs when the second arm 912 a is laid with respect to the base 31. That is, the first right spring 841 a may serve as a damper when the second arm 912 a is laid with respect to the base 31. As the first right spring 841 a serves as a damper, the load of the motor assembly 810 may be reduced.

The structure formed by the first left spring 841 b, the left bearing 830 a, 830 b, 830 c, and 830 d, the left slider 860 b, the left lead screw 840 b, and the second arm 912 a may be symmetrical with the structure formed by the first right spring 841 a, the right bearing 830 a, 830 b, 830 c, and 830 d, the right slider 860 a, the right lead screw 840 a, and the second arm 912 a. In this case, the axis of symmetry may be the axis of symmetry ys of the motor assembly 810.

Referring to FIG. 49 , the second spring 851 a, 851 b may be inserted into the guide 850 a, 850 b, 850 c, 850 d. Alternatively, the guide 850 a, 850 b, 850 c, 850 d may penetrate the second spring 851 a, 851 b. The second spring 851 a, 851 b may include a second right spring 851 a disposed in the right side of the motor assembly 810 and a second left spring 851 b disposed in the left side of the motor assembly 810.

A plurality of second right springs 851 a may be formed. The second right spring 851 a may include a spring 940 a, 940 b inserted into the first right guide 850 a and a spring 940 a, 940 b inserted into the second right guide 850 b. Alternatively, the second right spring 851 a may include a spring 940 a, 940 b through which the first right guide 850 a passes and a spring 940 a, 940 b through which the second right guide 850 b passes.

The guide 850 a, 850 b, 850 c, 850 d may include a locking jaw 852 a, 852 b. The locking jaw 852 a, 852 b may include a right locking jaw 852 a disposed in the right side of the motor assembly 810 and a left locking jaw 852 b disposed in the left side of the motor assembly 810.

The right locking jaw 852 a may be disposed between the right slider 860 a and the second right bearing 830 b. The second right spring 851 a may be disposed between the right slider 860 a and the second right bearing 830 b. One end of the second right spring 851 a may be in contact with or separated from the right slider 860 a. The other end of the second right spring 851 a may be in contact with or separated from the right locking jaw 852 a.

When the second arm 912 a is fully laid with respect to the base 31, the distance between the right slider 860 a and the right locking jaw 852 a may be a distance RD4. The second right spring 851 a may have a length greater than the distance RD4 in the state of being not compressed or tensioned. Thus, when the second arm 912 a is fully laid with respect to the base 31, the second right spring 851 a may be compressed between the right slider 860 a and the right locking jaw 852 a. The second right spring 851 a may provide a restoring force to the right slider 860 a in the +x axis direction.

When the second arm 912 a changes from the fully laid state to the standing state with respect to the base 31, the restoring force provided by the second right spring 851 a may assist the second arm 912 a to stand up. As the second right spring 851 a assists the second arm 912 a to stand, the load on the motor assembly 810 can be reduced.

The lead screw 840 a, 840 b may be driven by a single motor assembly 810. As the lead screw 840 a, 840 b is driven by a single motor assembly 810, the second arm 912 a, 912 b may stand up in symmetry. However, when the lead screw 840 a, 840 b is driven by a single motor assembly 810, the load on the motor assembly 810 to stand the second arm 912 a, 912 b may be excessively increased. At this time, the second right spring 851 a may assist the second arm 912 a to stand up so that the load on the motor assembly 810 can be decreased, thereby reducing the load on the motor assembly 810 to stand the second arm 912 a.

Alternatively, when the second arm 912 a changes from the standing state to the fully laid state with respect to the base 31, the restoring force provided by the second right spring 851 a can alleviate the shock that occurs when the second arm 912 a is laid with respect to the base 31. That is, the second right spring 851 a may serve as a damper when the second arm 912 a is laid with respect to the base 31. As the second right spring 851 a serves as a damper, the load of the motor assembly 810 may be reduced.

The structure formed by the second left spring 851 b, the left locking jaw 852 b, the left slider 860 b, the left guide 850 c, 850 d, and the second arm 912 a may be symmetric with the structure formed by the above-described second right spring 851 a, the right locking jaw 852 a, the right slider 860 a, the right guide 850 a, 850 b, and the second arm 912 a. In this case, the axis of symmetry may be the axis of symmetry ys of the motor assembly 810.

Referring to FIGS. 50 to 52 , the second arm 912 a may stand up by receiving a restoring force from the first right spring 841 a and the second right spring 851 a.

An angle formed by the second arm 912 a with respect to the base 31 may be referred to as an angle theta S. The angle formed by the right rod 870 a with respect to the base 31 may be referred to as an angle theta T. The force applied by the motor assembly 810 for moving the right slider 860 a in the +x-axis direction may be referred to as FA. The force exerted on the right slider 860 a by the first right spring 841 a may be referred to as FB. The force exerted on the right slider 860 a by the second right spring 851 a may be referred to as FC. The force transmitted by the right rod 870 a to the second arm 912 a may be referred to as FT.

When the second arm 912 a is fully laid with respect to the base 31, the angle theta S and the angle theta T may have minimum values. When the second arm 912 a changes from the fully laid state to the standing state with respect to the second base 31, the angle theta S and the angle theta T may be gradually increased.

When the second arm 912 a is fully laid with respect to the base 31, the first right spring 841 a may be compressed. The compressed first right spring 841 a may provide restoring force FB to the right slider 860 a. The restoring force FB may act in the +x direction. When the second arm 912 a is fully laid with respect to the base 31, the compression displacement amount of the first right spring 841 a may be maximized, and the magnitude of the restoring force FB may have a maximum value. When the second arm 912 a changes from the fully laid state to the standing state with respect to the base 31, the compression displacement amount of the first right spring 841 a may be gradually decreased, and the magnitude of the restoring force FB may be gradually decreased.

When the second arm 912 a is fully laid with respect to the base 31, the second right spring 851 a may be compressed. The compressed second right spring 851 a may provide restoring force FC to the right slider 860 a. The restoring force FC may act in the +x direction. When the second arm 912 a is fully laid with respect to the base 31, the compression displacement amount of the second right spring 851 a may be maximized, and the magnitude of the restoring force FC may have a maximum value. When the second arm 912 a changes from the fully laid state to the standing state with respect to the base 31, the compression displacement amount of the second right spring 851 a may be gradually decreased, and the magnitude of the restoring force FC may be gradually decreased.

The force FT that the right rod 870 a transmits to the second arm 912 a may be a summed force of the force FA applied by the motor assembly 810 for moving the right slider 860 a in the +x-axis direction, the restoring force FB of the first right spring 841 a, and the restoring force FC of the second right spring 851 a.

When the second arm 912 a starts to stand up in the state where the second arm 912 a is fully laid with respect to the base 31, the load of the motor assembly 810 may be maximized. At this time, the magnitude of the restoring force FB provided by the first right spring 841 a may be maximized. In addition, the magnitude of the restoring force FC provided by the second spring 851 a, 851 b may be maximized.

When the second arm 912 a changes from the fully laid state to the standing state with respect to the base 31, the restoring force provided by the first right spring 841 a and the second right spring 851 a may assist to stand the second arm 912 a. As the first right spring 841 a and the second right spring 851 a assist the second arm 912 a to stand, the load of the motor assembly 810 can be reduced.

The first right spring 841 a and the second right spring 851 a may simultaneously provide the restoring force (the summed force of the restoring force FB and the restoring force FC) to the right slider 860 a. The restoring force (the summed force of the restoring force FB and the restoring force FC) may be provided to the right slider 860 a until the distance RD5 between the right slider 860 a and the right locking jaw 852 a becomes equal to the length of the second right spring 851 a.

When the distance RD5 between the right slider 860 a and the right locking jaw 852 a is equal to the length of the second right spring 851 a, the compression displacement amount of the second right spring 851 a may become zero. When the compression displacement amount of the second right spring 851 a is zero, the restoring force FC provided by the second right spring 851 a to the right slider 860 a may be zero.

When the distance RD5 between the right slider 860 a and the right locking jaw 852 a is greater than the length of the second right spring 851 a, only the first right spring 841 a may provide the restoring force FB to the right slider 860 a. The restoring force FB may be provided to the right slider 860 a until the distance RD6 between the right slider 860 a and the second right bearing 830 b becomes equal to the length of the first right spring 841 a.

When the distance RD6 between the right slider 860 a and the second right bearing 830 b is equal to the length of the first right spring 841 a, the compression displacement amount of the first right spring 841 a may be zero. When the compression displacement amount of the first right spring 841 a becomes zero, the restoring force FB provided by the first right spring 841 a to the right slider 860 a may be zero.

When the distance RD6 between the right slider 860 a and the second right bearing 830 b is greater than the length of the first right spring 841 a, the motor assembly 810 may stand the second arm 912 a without receiving the restoring force from the first right spring 841 a or the second right spring 851 a.

The structure formed by the first left spring 841 b, the second left spring 851 b, the left locking jaw 852 b, the left slider 860 b, the left guide 850 c, 850 d, the left lead screw 840 b, the left rod 870 b, and the second arm 912 a may be symmetrical with the structure formed by the first right spring 841 a, the second right spring 851 a, the right locking jaw 852 a, the right slider 860 a, the right guide 850 a, 850 b, the right lead screw 840 a, the right rod 870 a, and the second arm 912 a. In this case, the axis of symmetry may be the axis of symmetry ys of the motor assembly 810.

Referring to FIG. 53 , the pusher 930 a, 930 b may be connected to the link mount 920 a, 920 b. The pusher 930 a, 930 b may include a right pusher 930 a disposed in the right side of the motor assembly 810 and a left pusher 930 b disposed in the left side of the motor assembly 810.

The link mount 920 a, 920 b may form an accommodation space A. The

accommodation space A may accommodate the spring 940 a, 940 b and the pusher 930 a, 930 b. The spring 940 a, 940 b may include a right spring 940 a disposed in the right side of the motor assembly 810 and a left spring 940 b disposed in the left side of the motor assembly 810. The accommodation space A may be referred to as an internal space A.

The link mount 920 a, 920 b may include a first hole 922 a connecting the accommodation space A and an external space (the first hole corresponding to 920 b is not shown). The first hole 922 a may be formed in the upper surface of the link mount 920 a, 920 b. The first hole 922 a may be referred to as a hole 922 a.

The pusher 930 a, 930 b may be located perpendicular to the base 31. Alternatively, the pusher 930 a, 930 b may be disposed parallel to the y axis. The spring 940 a, 940 b may be located perpendicular to the base 31. Alternatively, the spring 940 a, 940 b may be disposed parallel to the y axis.

The pusher 930 a, 930 b may include a first part 931 a, 931 b and a second part 932 a, 932 b. The second part 932 a, 932 b may be connected to the lower side of the first part 931 a, 931 b. The lower end of the second part 932 a, 932 b may be connected to the spring 940 a, 940 b. All or part of the second part 932 a, 932 b may be accommodated in the accommodation space A formed by the link mount 920 a, 920 b. The second part 932 a, 932 b may have a diameter equal to the diameter of the first hole 922 a or may have a diameter smaller than the diameter of the first hole 922 a. The second part 932 a, 932 b may penetrate the first hole 922 a.

The first part 931 a, 931 b may be located outside the link mount 920 a, 920 a. Alternatively, the first part 931 a, 931 b may be located outside the accommodation space A of the link mount 920 a, 920 b. The first part 931 a, 931 b may have a diameter larger than the diameter of the first hole 922 a.

The first part 931 a, 931 b may be in contact with or spaced apart from the link bracket 951 a, 951 b. For example, when the second arm 912 a, 912 b is fully laid with respect to the base 31, the first part 931 a, 931 b may be in contact with the link bracket 951 a, 951 b. Alternatively, when the second arm 912 a, 912 b fully stands up with respect to the base 31, the first part 931 a, 931 b may be spaced apart from the link bracket 951 a, 951 b.

When the first part 931 a, 931 b is in contact with the link bracket 951 a, 951 b, the pusher 930 a, 930 b may receive a force from the link bracket 951 a, 951 b. The force applied to the pusher 930 a, 930 b may be in a downward direction. Alternatively, the force applied to the pusher 930 a, 930 b may be in the −y axis direction. Alternatively, the link bracket 951 a, 951 b may press the pusher 930 a, 930 b. The direction in which the link bracket 951 a, 951 b presses the pusher 930 a, 930 b may be downward. Alternatively, the direction in which the link bracket 951 a, 951 b presses the pusher 930 a, 930 b may be in the -y axis direction.

When the first part 931 a, 931 b is applied with a force, the spring 940 a, 940 b may be compressed. The compressed spring 940 a, 940 b may provide restoring force to the pusher 930 a, 930 b. The direction of the restoring force may be opposite to the direction of the force applied to the first part 931 a, 931 b. Alternatively, the restoring force may act in the +y-axis direction.

The link mount 920 a, 920 b may include a second hole 921 a (the second hole corresponding to 920 b is not shown). The second hole 921 a may connect the accommodation space A and the external space. All or part of the spring 940 a, 940 b may be exposed to the outside through the second hole 921 a. All or part of the pusher 930 a, 930 b may be exposed to the outside through the second hole 921 a. In the maintenance or repair of the display device, a service provider may check the operating state of the pusher 930 a, 930 b through the second hole 921 a. The second hole 921 a may provide a service provider with convenience of maintenance or repair.

Referring to FIGS. 54 to 56 , the right link 910 a may stand up by receiving the restoring force from the right pusher 930 a. It will be described based on the right link 910 a.

An angle formed by the second arm 912 a with respect to the base 31 may be referred to as an angle theta S. The force transmitted by the right rod 870 a to the second arm 912 a may be referred to as FT. The force transmitted by the right pusher 930 a to the right link bracket 951 a may be referred to as FP.

Referring to FIG. 54 , when the second arm 912 a is fully laid with respect to the base 31, the angle theta S may have a minimum value. The right spring 940 a connected to the right pusher 930 a may be compressed maximally, and the magnitude of the restoring force FP may have a maximum value. The compressed right spring 940 a may provide restoring force FP to the right pusher 930 a. The right pusher 930 a may transmit the restoring force FP to the right link bracket 951 a. The restoring force FP can act in the +y-axis direction.

If the second arm 912 a is fully laid with respect to the base 31, the distance HL from the base 31 to the upper end of the right pusher 930 a may have a minimum value. The first part 931 a of the right pusher 930 a may protrude to the outside of the right link mount 920 a, and the second part 932 a of the right pusher 930 a may be fully accommodated in the accommodation space 923 a of the right link mount 920 a.

Referring to FIG. 55 , when the second arm 912 a changes from the fully laid state to the standing state with respect to the base 31, the angle theta S may gradually increase. The compression displacement amount of the right spring 940 a may gradually decrease, and the magnitude of the restoring force FP may gradually decrease.

As the angle theta S gradually increases, at least a part of the second part 932 a of the right pusher 930 a may protrude to the outside of the right link mount 920 a. The length by which the second part 932 a of the right pusher 930 a protrudes to the outside of the right link mount 920 a may be referred to as a length HP. The distance HL from the base 31 to the upper end of the right pusher 930 a may increase by HP than a case where the second arm 912 a is fully laid with respect to the base 31.

Referring to FIG. 56 , when the second arm 912 a stands up with respect to the base 31, the right pusher 930 a and the right link bracket 951 a may be separated from each other. The compression displacement amount of the right spring 940 a may be zero. When the compression displacement amount of the right spring 940 a becomes zero, the restoring force FP provided by the right pusher 930 a to the right link bracket 951 a may be zero.

In addition, the length HP by which the second part 932 a of the right pusher 930 a protrudes to the outside of the right link mount 920 a may have a maximum value. The distance HL from the base 31 to the upper end of the right pusher 930 a may have a maximum value.

That is, the right pusher 930 a may assist the second arm 912 a to stand and reduce the load of the motor assembly 810 by applying a restoring force to the right link bracket 951 a, while the right pusher 930 a and the right link bracket 951 a are in contact with each other.

The lead screw 840 a, 840 b may be driven by a single motor assembly 810. As the lead screw 840 a, 840 b is driven by a single motor assembly 810, the second arm 912 a, 912 b can stand up in symmetry. However, when the lead screw 840 a, 840 b is driven by a single motor assembly 810, the load on the motor assembly 810 to stand the second arm 912 a, 912 b may be excessively increased. At this time, the right pusher 930 a may apply the restoring force to the right link bracket 951 a, thereby assisting the second arm 912 a to stand up and reducing the load of the motor assembly 810.

Alternatively, when the second arm 912 a changes from the standing state to the fully laid state with respect to the base 31, the restoring force that the right pusher 930 a provides to the right link bracket 951 a can alleviate the shock that occurs when the link 910 a is laid with respect to the base 31. That is, the restoring force provided by the right pusher 930 a to the right link bracket 951 a may serve as a damper when the link 910 a is laid with respect to the base 31. As the right pusher 930 a serves as a damper, the load of the motor assembly 810 may be reduced.

The structure formed by the left pusher 930 b, the left spring 940 b, the left link bracket 951 b, the left link mount 920 b, and the left rod 870 b may be symmetric with the structure formed by the right pusher 930 a, the right spring 940 a, the right link bracket 951 a, the right link 910 a mount, and the right rod 870 a. In this case, the axis of symmetry may be the axis of symmetry of the motor assembly 810.

Referring to FIGS. 57 to 59 , the panel roller 143 may be installed in the base 31. The panel roller 143 may be installed in front of the lead screw 840 a, 840 b. Alternatively, the panel roller 143 may be disposed in parallel with the length direction of the lead screw 840 a, 840 b. Alternatively, the panel roller 143 may be spaced apart from the lead screw 840 a, 840 b.

The display unit 20 may include a display panel 10 and a module cover 15. The lower side of the display unit 20 may be connected to the panel roller 143, and the upper side of the display unit 20 may be connected to the upper bar 75. The display unit 20 may be wound around or unwound from the panel roller 143.

The distance from the axis of symmetry ys of the motor assembly 810 to the right slider 860 a may be referred to as a distance RD. The distance from the axis of symmetry ys of the motor assembly 810 to the left slider 860 b may be referred to as a distance LD. The distance between the right slider 860 a and the left slider 860 b may be referred to as a distance SD. The distance SD may be the sum of the distance RD and the distance LD. The distance from the base 31 to the upper end of the display unit 20 may be referred to as a distance HD.

Referring to FIG. 57 , when the second arm 912 a, 912 b is fully laid with respect to the base 31, the distance SD between the right slider 860 a and the left slider 860 b may have a minimum value. The distance RD from the axis of symmetry ys of the motor assembly 810 to the right slider 860 a may be the same as the distance LD from the axis of symmetry ys of the motor assembly 810 to the left slider 860 b.

When the second arm 912 a, 912 b is fully laid with respect to the base 31, the distance HD from the base 31 to the upper end of the display unit 20 may have a minimum value.

When the second arm 912 a, 912 b is fully laid with respect to the base 31, the first spring 841 a, 841 b may contact the slider 860 a, 860 b. In addition, the second spring 851 a, 851 b may contact the slider 860 a, 860 b. In addition, the pusher 930 a, 930 b may contact the link bracket 951 a, 951 b.

When the second arm 912 a, 912 b is fully laid with respect to the base 31, the amount of compression of the first spring 841 a, 841 b may have a maximum value, and the magnitude of the restoring force provided to the slider 860 a, 860 b by the first spring 841 a, 841 b may have a maximum value.

When the second arm 912 a, 912 b is fully laid with respect to the base 31, the amount of compression of the second spring 851 a, 851 b may have a maximum value, and the magnitude of the restoring force provided to the slider 860 a, 860 b by the second spring 851 a, 851 b may have a maximum value.

When the second arm 912 a, 912 b is fully laid with respect to the base 31, the amount of compression of the spring 940 a, 940 b may have a maximum value, and the magnitude of the restoring force provided to the pusher 930 a, 930 b by the spring 940 a, 940 b may have a maximum value.

When the second arm 912 a, 912 b start to stand with respect to the base 31, the second arm 912 a, 912 b may stand by receiving a restoring force from the first spring 841 a, 841 b, the second spring 851 a, 851 b, and the spring 940 a, 940 b. Thus, the load on the motor assembly 810 may be reduced.

Referring to FIG. 58 , as the second arm 912 a, 912 b stands with respect to the base 31, the distance SD between the right slider 860 a and the left slider 860 b may gradually increase. Even if the distance SD increases, the distance LD and the distance RD may be equal to each other. That is, the right slider 860 a and the left slider 860 b may be symmetrically located with respect to the axis of symmetry ys of the motor assembly 810. In addition, the extent to which the second arm 912 a, 912 b of the right link 910 a stands with respect to the base 31 and may be equal to the extent to which the second arm 912 a, 912 b of the left link 910 b stands with respect to the base 31.

As the second arm 912 a, 912 b stands with respect to the base 31, the distance HD from the base 31 to the upper end of the display unit 20 may gradually increase. The display unit 20 may be unwound from the panel roller 143. Alternatively, the display unit 20 may be unfolded from the panel roller 143.

When the second arm 912 a, 912 b fully stands up with respect to the base 31, the first spring 841 a, 841 b may be separated from the slider 860 a, 860 b. In addition, when the second arm 912 a, 912 b fully stands up with respect to the base 31, the second spring 851 a, 851 b may be separated from the slider 860 a, 860 b. In addition, when the second arm 912 a, 912 b stands up with respect to the base 31, the pusher 930 a, 930 b may be separated from the link bracket 951 a, 951 b.

The separation of the first spring 841 a, 841 b from the slider 860 a, 860 b, the separation of the second spring 851 a, 851 b from the slider 860 a, 860 b, and the separation of the pusher 930 a, 930 b from the link bracket 951 a, 951 b may proceed independently of each other. That is, the order of the separation of the first spring 841 a, 841 b from the slider 860 a, 860 b, the separation of the second spring 851 a, 851 b from the slider 860 a, 860 b, and the separation of the pusher 930 a, 930 b from the link bracket 951 a, 951 b may be mutually variable.

The angle formed between the axis xs1 parallel to the base 31 and the second arm 912 a may be referred to as theta R. The angle formed between the axis xs1 parallel to the base 31 and the first arm 911 a may be referred to as theta R′. The axis xs1 and x-axis may be parallel.

When the second arm 912 a is fully laid with respect to the base 31, or while the second arm 912 a stands up with respect to the base 31, or when the standing of the second arm 912 a with respect to the base 31 is completed, theta R and theta R′ can be maintained to be the same.

The angle formed between the axis xs2 parallel to the base 31 and the second arm 912 b may be referred to as theta L. The angle formed between the axis xs2 parallel to the base 31 and the first arm 911 b may be referred to as theta L′. The axis xs2 and x-axis may be parallel.

When the second arm 912 b is fully laid with respect to the base 31, or while the second arm 912 b stands up with respect to the base 31, or when the standing of the second arm 912 a with respect to the base 31 is completed, theta L and theta L′ can be maintained to be the same.

The axis xs1 and the axis xs2 may be the same axis mutually.

Referring to FIG. 59 , when the second arm 912 a, 912 b fully stands up with

respect to the base 31, the distance SD between the right slider 860 a and the left slider 860 b may have a maximum value. Even when the distance SD is maximized, the distance LD and the distance RD may be equal to each other.

When the second arm 912 a, 912 b fully stands up with respect to the base 31, the distance HD from the base 31 to the upper end of the display unit 20 may have a maximum value.

Referring to FIG. 60 , the display panel 10 may be flexible. The display panel 10 may include a substrate and an organic compound layer formed on the substrate. For example, the substrate may be a glass panel. In another example, the substrate may be a plastic panel. In yet another example, the substrate may be a hybrid panel. The display panel 10 having the glass panel as the substrate may be referred to as a Glass-OLED panel. The display panel 10 having the plastic panel as the substrate may be referred to as a Plastic-OLED panel. The display panel 10 having a combination of the plastic panel and the glass panel as the substrate may be referred to a Hybrid-OLED panel.

The module cover 15 may be coupled to the display panel 10 at the rear of the display panel 10. The module cover 15 may include a plurality of segments. The segments may face or oppose the rear surface of the display panel 10. The segments may be disposed adjacent to each other. The plurality of segments may be connected to each other to form a link.

The panel protector 97 may be disposed between the display panel 10 and the module cover 15. The panel protector 97 may be referred to as an adhesive member 970, or an adhesive sheet 970, or a bonding sheet 970. The bonding sheet 970 may include a first layer 971, a second layer 973, a third layer 975, and a fourth layer 977. The first layer 971 may be an adhesive layer 971. The second layer 973 may be a film layer 973. For example, the second layer 973 may be a Polyethylene Terephthalate (PET) film. The third layer 975 may be a buffer layer 975. For example, the third layer 975 may be a foam layer 975. The fourth layer 977 may be an adhesive layer 977.

Referring to FIG. 61 , the adhesive layers 971 and 977 may be disposed between the display panel 10 and the module cover 15. Front surfaces of the adhesive layers 971 and 977 may be adhered or fixed to the rear surface of the display panel 10. Rear surfaces of the adhesive layers 971 and 977 may be adhered or fixed to front surfaces of the segments of the module cover 15.

For example, a thickness T1 of the display panel 10 may be in a range of 320 μm to 370 μm, thicknesses T2 and T5 of the adhesive layers 971 and 977 may be in a range of 120 μm to 170 μm. Gaps G1 between the segments of the module cover 15 may be spaced apart from each other. For example, the gap G1 between the segments of the module cover 15 may be in a range of 0.1 mm to 0.4 mm.

As the display panel 10 is flexible and is coupled to the segments of the module cover 15 via the adhesive layers 971 and 977, flatness of the display panel may be degraded due to the segments of the module cover 15.

As the display panel 10 and the module cover 15 are wound around the roller, a bending moment may be applied to the display panel 10 and the adhesive layers 971 and 977. A neutral axis CL may be located in the middle of a region A corresponding to a combination of the thickness T1 of the display panel 10 and the thicknesses T2 and T5 of the adhesive layers 971 and 977. A first region A1 may extend from the front surface of the display panel 10 to the neutral axis CL, and a second region A2 may extend from the neutral axis CL to the rear surfaces of the adhesive layers 971 and 977.

When a bending force acts on the display panel 10 in a clockwise direction IW, the first region A1 may be compressed and the second region A2 may be tensioned. When the bending force acts on the display panel 10 in a counterclockwise direction OW, the first region A1 may be tensioned and the second region A2 may be compressed. The clockwise direction IW may be referred to as an inward direction relative to the front surface of the display panel 10, and the counterclockwise direction may be referred to as an outward direction relative to the front surface of the display panel 10.

For example, when the display panel 10 is wound in the clockwise direction IW, the first region A1 is compressed and the second region A2 is tensioned. In this case, the rolling characteristics of the display panel 10 may be degraded due to a tension and/or compression limit of the display panel 10 and the adhesive layers 971 and 977 which are flexible but relatively rigid.

Referring to FIG. 62 , the adhesive layers 971 and 977 may be disposed between the display panel 10 and the module cover 15. The adhesive layer 971 may be adhered or fixed to the rear surface of the display panel 10. The adhesive layer 977 may be adhered or fixed to the front surfaces of the segments of the module cover 15.

For example, the thickness T1 of the display panel 10 may be in a range of 320 μm to 370 μm, and the thicknesses T2 and T5 of the adhesive layers 971 and 977 may be in a range of 42 μm to 47 μm. The gaps G1 between the segments of the module cover 15 may be spaced apart from each other. For example, the gap G1 between the segments of the module cover 15 may be in a range of 0.1 mm to 0.4 mm.

The film layer 973 may be disposed between the adhesive layer 971 and the adhesive layer 977. The film layer 973 may be adhered or fixed to the adhesive layer 977. The buffer layer 975 may be disposed between the film layer 973 and the adhesive layer 971. The buffer layer 975 may be formed on the film layer 973, with the film layer 973 serving as the substrate. The buffer layer 975 may be laminated with the film layer 973 and may be adhered or fixed to the adhesive layer 971.

For example, a thickness T4 of the film layer 973 may be in a range of 47 μm to 52 μm, and a thickness T3 of the buffer layer 975 may be in a range of 480 μm to 530 μm.

As the buffer layer 975 is disposed between the segments of the module cover 15 and the display panel 10, flatness of the display panel 10 may be improved.

As the display panel 10 and the module cover 15 are wound around the roller, a bending moment may be applied to the display panel 10, the buffer layer 975, the film layer 973, and the adhesive layers 971 and 977. A neutral axis CL may be located in the middle of a region A corresponding to a combination of the thickness T1 of the display panel 10, the thickness T3 of the buffer layer 975, the thickness T4 of the film layer 973, and the thicknesses T2 and T5 of the adhesive layers 971 and 977. For example, the neutral axis CL may be located in the buffer layer 975. A first region A1 may extend from the front surface of the display panel 10 to the neutral axis CL, and a second region A2 may extend from the neutral axis CL to the rear surface of the adhesive layer 977.

When a bending force acts on the display panel 10 in the clockwise direction IW, the first region A1 may be compressed and the second region A2 may be tensioned. When the bending force acts on the display panel 10 in the counterclockwise direction OW, the first region A1 may be tensioned and the second region A2 may be compressed. The clockwise direction IW may be referred to as an inward direction relative to the front surface of the display panel 10, and the counterclockwise direction may be referred to as an outward direction relative to the front surface of the display panel 10.

For example, when the display panel 10 is wound in the clockwise direction IW, the first region A1 is compressed and the second region A2 is tensioned. In this case, there may be a limitation in improving the rolling characteristics of the display panel 10 due to a tension and/or compression limit of the display panel 10 and the film layer 973 which are flexible but relatively rigid.

Referring to FIG. 63 , the adhesive layers 971 and 977 may be disposed between the display panel 10 and the module cover 15. The adhesive layer 971 may be adhered or fixed to the rear surface of the display panel 10. The adhesive layer 977 may be adhered or fixed to the front surfaces of the segments of the module cover 15.

For example, the thickness T1 of the display panel 10 may be in a range of 320 μm to 370 μm, and the thicknesses T2 and T5 of the adhesive layers 971 and 977 may be in a range of 43 μm to 47 μm. The gaps G1 between the segments of the module cover 15 may be spaced apart from each other. For example, the gap G1 between the segments of the module cover 15 may be in a range of 0.1 mm to 0.4 mm.

The film layer 973 may be disposed between the adhesive layer 971 and the adhesive layer 977. The film layer 973 may be adhered or fixed to the adhesive layer 977. The buffer layer 975 may be disposed between the film layer 973 and the adhesive layer 971. The buffer layer 975 may be formed on the film layer 973, with the film layer 973 serving as the substrate. The buffer layer 975 may be laminated with the film layer 973 and may be adhered or fixed to the adhesive layer 971.

For example, the thickness T4 of the film layer 973 may be in a range of 46 μm to 55 μm, and the thickness T3 of the buffer layer 975 may be in a range of 120 μm to 180 μm.

As the buffer layer 975 is disposed between the segments of the module cover 15 and the display panel 10, flatness of the display panel 10 may be improved.

As the display panel 10 and the module cover 15 are wound around the roller, a bending moment may be applied to the display panel 10, the buffer layer 975, the film layer 973, and the adhesive layers 971 and 977. A neutral axis CL may be located in the middle of a region A corresponding to a combination of the thickness T1 of the display panel 10, the thickness T3 of the buffer layer 975, the thickness T4 of the film layer 973, and the thicknesses T2 and T5 of the adhesive layers 971 and 977. For example, the neutral axis CL may be located in the buffer layer 975. A first region A1 may extend from the front surface of the display panel 10 to the neutral axis CL, and a second region A2 may extend from the neutral axis CL to the rear surface of the adhesive layer 977.

When a bending force acts on the display panel 10 in the clockwise direction IW, the first region A1 may be compressed and the second region A2 may be tensioned. When the bending force acts on the display panel 10 in the counterclockwise direction OW, the first region Al may be tensioned and the second region A2 may be compressed. The clockwise direction IW may be referred to as an inward direction relative to the front surface of the display panel 10, and the counterclockwise direction may be referred to as an outward direction relative to the front surface of the display panel 10.

For example, when the display panel 10 is wound in the clockwise direction IW, the first region A1 is compressed and the second region A2 is tensioned. In this case, the rolling characteristics of the display panel 10, affected by a tension and/or compression limit of the display panel 10 and the film layer 973 which are flexible but relatively rigid, may be improved by reducing the thickness between the display panel and the film layer 973.

Referring to FIG. 64 , the adhesive layers 971 and 977 may be disposed between the display panel 10 and the module cover 15. The adhesive layer 971 may be adhered or fixed to the rear surface of the display panel 10. The adhesive layer 977 may be adhered or fixed to the front surfaces of the segments of the module cover 15.

For example, the thickness T1 of the display panel 10 may be in a range of 320 μm to 370 μm, and the thicknesses T2 and T5 of the adhesive layers 971 and 977 may be in a range of 40 μm to 50 μm. The gaps G1 between the segments of the module cover 15 may be spaced apart from each other. For example, the gap G1 between the segments of the module cover 15 may be in a range of 0.1 mm to 0.4 mm.

The film layer 973 may be disposed between the adhesive layer 971 and the adhesive layer 977. The film layer 973 may be adhered or fixed to the adhesive layer 971. The buffer layer 975 may be disposed between the film layer 973 and the adhesive layer 977. The buffer layer 975 may be formed under the film layer 973, with the film layer 973 serving as the substrate. The buffer layer 975 may be laminated with the film layer 973 and may be adhered or fixed to the adhesive layer 977.

For example, the thickness T4 of the film layer 973 may be in a range of 46 μm to 53 μm, and the thickness T3 of the buffer layer 975 may be in a range of 145 μm to 180 μm.

As the buffer layer 975 is disposed between the segments of the module cover 15 and the display panel 10, flatness of the display panel 10 may be improved.

As the display panel 10 and the module cover 15 are wound around the roller, a bending moment may be applied to the display panel 10, the film layer 973, the buffer layer 975, and the adhesive layers 971 and 977. A neutral axis CL may be located in the middle of a region A corresponding to a combination of the thickness T1 of the display panel 10, the thickness T4 of the film layer 973, and the thickness T2 of the adhesive layer 971. For example, the neutral axis CL may be located in the display panel 10. A first region A1 may extend from the front surface of the display panel 10 to the neutral axis CL, and a second region A2 may extend from the neutral axis CL to the rear surface of the film layer 973.

When a bending force acts on the display panel 10 in the clockwise direction IW, the first region A1 may be compressed and the second region A2 may be tensioned. When the bending force acts on the display panel 10 in the counterclockwise direction OW, the first region A1 may be tensioned and the second region A2 may be compressed. The clockwise direction IW may be referred to as an inward direction relative to the front surface of the display panel 10, and the counterclockwise direction may be referred to as an outward direction relative to the front surface of the display panel 10.

For example, when the display panel 10 is wound in the clockwise direction IW, the first region A1 is compressed and the second region A2 is tensioned. In this case, the rolling characteristics of the display panel 10, affected by a tension and/or compression limit of the display panel 10 and the film layer 973 which are flexible but relatively rigid, may be improved by reducing the thickness between the display panel 10 and the film layer 973. In other words, as the neutral axis CL is located in the display panel 10, the rolling characteristics of the display panel 10, the adhesive layer 971, and the film layer 973 may be improved.

In addition, the buffer layer 975, which is highly flexible, is disposed between the film layer 973 and the module cover 15, thereby improving the rolling characteristics of the display panel 10, as well as improving degradation of flatness of the display panel 10 which is caused by the segments of the module cover 15.

Referring to FIG. 65 , the adhesive layers 971 and 977 may be disposed between the display panel 10 and the module cover 15. The adhesive layer 971 may be adhered or fixed to the rear surface of the display panel 10. The adhesive layer 977 may be adhered or fixed to the front surfaces of the segments of the module cover 15.

For example, the thickness T1 of the display panel 10 may be in a range of 320 μm to 370 μm, and the thicknesses T2 and T5 of the adhesive layers 971 and 977 may be in a range of 40 μm to 50 μm. The gaps G1 between the segments of the module cover 15 may be spaced apart from each other. For example, the gap G1 between the segments of the module cover 15 may be in a range of 0.1 mm to 0.4 mm.

The film layer 973 may be disposed between the adhesive layer 971 and the adhesive layer 977. The film layer 973 may be adhered or fixed to the adhesive layer 971. The buffer layer 975 may be disposed between the film layer 973 and the adhesive layer 977. The buffer layer 975 may be formed under the film layer 973, with the film layer 973 serving as the substrate. The buffer layer 975 may be laminated with the film layer 973 and may be adhered or fixed to the adhesive layer 977.

For example, the thickness T4 of the film layer 973 may be in a range of 45 μm to 57 μm, and the thickness T3 of the buffer layer 975 may be in a range of 450 μm to 680 μm.

As the buffer layer 975 is disposed between the segments of the module cover 15 and the display panel 10, flatness of the display panel 10 may be improved.

As the display panel 10 and the module cover 15 are wound around the roller, a bending moment may be applied to the display panel 10, the film layer 973, the buffer layer 975, and the adhesive layers 971 and 977. A neutral axis CL may be located in the middle of a region A corresponding to a combination of the thickness T1 of the display panel 10, the thickness T4 of the film layer 973, and the thickness

T2 of the adhesive layer 971. For example, the neutral axis CL may be located in the display panel 10. A first region A1 may extend from the front surface of the display panel 10 to the neutral axis CL, and a second region A2 may extend from the neutral axis CL to the rear surface of the film layer 973.

When a bending force acts on the display panel 10 in the clockwise direction IW, the first region A1 may be compressed and the second region A2 may be tensioned. When the bending force acts on the display panel 10 in the counterclockwise direction OW, the first region A1 may be tensioned and the second region A2 may be compressed. The clockwise direction IW may be referred to as an inward direction relative to the front surface of the display panel 10, and the counterclockwise direction may be referred to as an outward direction relative to the front surface of the display panel 10.

For example, when the display panel 10 is wound in the clockwise direction IW, the first region A1 is compressed and the second region A2 is tensioned. In this case, the rolling characteristics of the display panel 10, affected by a tension and/or compression limit of the display panel 10 and the film layer 973 which are flexible but relatively rigid, may be improved by reducing the thickness between the display panel 10 and the film layer 973. In other words, as the neutral axis CL is located in the display panel 10, the rolling characteristics of the display panel 10, the adhesive layer 971, and the film layer 973 may be improved.

In addition, the buffer layer 975, which is highly flexible and relatively thick, is disposed between the film layer 973 and the module cover 15, thereby improving the rolling characteristics of the display panel 10, as well as improving degradation of flatness of the display panel 10 which is caused by the segments of the module cover 15.

Referring to FIGS. 1 to 65 , a display device includes: a housing which is elongated and has a base; a roller rotatably mounted on the base in the housing; a display panel wound on or unwound from the roller; a module cover elongated in a longitudinal direction of the housing, having a plurality of segments sequentially arranged in an up-down direction of the display panel at a rear of the display panel, and wound around or unwound from the roller together with the display panel; a bonding sheet disposed between the display panel and the module cover and adhered to the display panel and the module cover; and a foldable link disposed at a rear of the display panel, and having one side pivotably connected to the base and the other side pivotably connected to an upper side of the module cover to raise the display panel and the module cover while unwinding the display panel and the module cover from the roller, wherein the bonding sheet includes: a film layer disposed between the display panel and the module cover; and a buffer layer disposed between the film layer and the module cover.

In addition, the bonding sheet may include: a first adhesive layer disposed between the film layer and the display panel; and a second adhesive layer disposed between the module cover and the buffer layer.

In addition, the buffer layer may come into contact with the film layer, the film layer may be adhered to the first adhesive layer, and the buffer layer may be adhered to the second adhesive layer.

In addition, a thickness of the display panel may be greater than a thickness of the film layer, and a thickness of the buffer layer may be greater than the thickness of the display panel.

In addition, thicknesses of the first adhesive layer and the second adhesive layer may be smaller than the thickness of the film layer.

In addition, a neutral line parallel to a longitudinal direction of the display panel, the first adhesive layer, and the film layer may be located in the display panel.

In addition, the thickness of the display panel may be in a range of 320 μm to 370 μm, the thickness of the first adhesive layer or the second adhesive layer may be in a range of 40 μm to 50 μm, the thickness of the film layer may be in a range of 45 μm to 57 μm, and the thickness of the buffer layer may be in a range of 450 μm to 680 μm.

In addition, a strength of the buffer layer may be lower than a strength of the film layer.

In addition, the buffer layer may be a foam layer formed at the film layer serving as a substrate.

In addition, the plurality of segments of the module cover may be disposed adjacent to each other, wherein a gap between at least two of the plurality of segments may be in a range of 0.1 mm to 0.4 mm.

Certain embodiments or other embodiments of the disclosure described above are not mutually exclusive or distinct from each other. Any or all elements of the embodiments of the disclosure described above may be combined or combined with each other in configuration or function.

For example, a configuration “A” described in one embodiment of the disclosure and the drawings and a configuration “B” described in another embodiment of the disclosure and the drawings may be combined with each other. Namely, although the combination between the configurations is not directly described, the combination is possible except in the case where it is described that the combination is impossible.

Although embodiments have been described with reference to a number of illustrative embodiments thereof, it should be understood that numerous other modifications and embodiments can be devised by those skilled in the art that will fall within the scope of the principles of this disclosure. More particularly, various variations and modifications are possible in the component parts and/or arrangements of the subject combination arrangement within the scope of the disclosure, the drawings and the appended claims. In addition to variations and modifications in the component parts and/or arrangements, alternative uses will also be apparent to those skilled in the art. 

1. A display device comprising: a housing which is elongated and has a base; a roller rotatably mounted on the base in the housing; a display panel wound around or unwound from the roller; a module cover elongated in a longitudinal direction of the housing, having a plurality of segments sequentially arranged in an up-down direction of the display panel at a rear of the display panel, and wound around or unwound from the roller together with the display panel; a bonding sheet disposed between the display panel and the module cover and adhered to the display panel and the module cover; and a foldable link disposed at a rear of the display panel, and having one side pivotably connected to the base and the other side pivotably connected to an upper side of the module cover to raise the display panel and the module cover while unwinding the display panel and the module cover from the roller, wherein the bonding sheet comprises: a film layer disposed between the display panel and the module cover; and a buffer layer disposed between the film layer and the module cover.
 2. The display device of claim 1, wherein the bonding sheet comprises: a first adhesive layer disposed between the film layer and the display panel; and a second adhesive layer disposed between the module cover and the buffer layer.
 3. The display device of claim 2, wherein the buffer layer comes into contact with the film layer, the film layer is adhered to the first adhesive layer, and the buffer layer is adhered to the second adhesive layer.
 4. The display device of claim 3, wherein a thickness of the display panel is greater than a thickness of the film layer, and a thickness of the buffer layer is greater than the thickness of the display panel.
 5. The display device of claim 4, wherein thicknesses of the first adhesive layer and the second adhesive layer are smaller than the thickness of the film layer.
 6. The display device of claim 5, wherein a neutral line parallel to a longitudinal direction of the display panel, the first adhesive layer, and the film layer is located in the display panel.
 7. The display device of claim 6, wherein the thickness of the display panel is in a range of 320 μm to 370 μm, the thickness of the first adhesive layer or the second adhesive layer is in a range of 40 μm to 50 μm, the thickness of the film layer is in a range of 45 μm to 57 μm and the thickness of the buffer layer is in a range of 450 μm to 680 μm.
 8. The display device of claim 7, wherein a strength of the buffer layer is lower than a strength of the film layer.
 9. The display device of claim 8, wherein the buffer layer is a foam layer formed at the film layer serving as a substrate.
 10. The display device of claim 9, wherein the plurality of segments of the module cover are disposed adjacent to each other, wherein a gap between at least two of the plurality of segments is in a range of 0.1 mm to 0.4 mm. 